Option for unload timer to free up vram/memory

[pmffromspace]

I tried to use the --unload-timer from your other openedai-* projects, but it seems I either used it wrongly or its not supported yet.

Is there an option to unload the memory after x seconds when idle?

Other than that it works really well!

[matatonic]

I added this in 0.42.0, but I haven't tested it yet (!). As I get more time I will test, but you're welcome to try it out and report back.